We are building a social newsreader. There will be 3 modules.
- The first module will crawl the Facebook and Twitter feeds.
- The second module will extract important concepts from the feed. i.e. entities, links or twitter usernames. (In the example below, you can see how there is an entity from position 14 through 22, another entity from position 0 to 5 and so on)
- The third module will format each post as follows:
- Entities should be wrapped in "strong" tags
- Links should be wrapped in "a href" tags that point to the corresponding links
- Twitter usernames should be wrapped in "a href" tags that point to "http://twitter.com/username" and are displayed as the username
Please write the code for the third module that takes the output from the second module as an input and produces formatted text. This is a code design question, so we are looking for strong OOD principles. Think about what data structures, objects and classes that you want to use to structure/define your input. What is the best code design to prevent others from making mistakes when using your code? If somebody was to extend your code with new types like "hashtags" (that would be decorated with another HTML tag): how complex/error prone would it be?
Input Example:
Obama visited Facebook headquarters: http://bit.ly/xyz @elversatile
positions 14 through 22 → Entity
positions 0 through 5 → Entity
positions 48 through 56 → Twitter username
positions 37 through 47 → Link
Output Example:
<strong>Obama</strong> visited <strong>Facebook</strong> headquarters: <a
href="http://bit.ly/xyz">http://bit.ly/xyz</a> @<a href="http://twitter.com/elversatile">elversatile</a>